EP3279523A1 - Actuation unit for controlling the angular position of a control member, particularly for a vehicle transmission - Google Patents

Actuation unit for controlling the angular position of a control member, particularly for a vehicle transmission Download PDF

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Publication number
EP3279523A1
EP3279523A1 EP17184475.6A EP17184475A EP3279523A1 EP 3279523 A1 EP3279523 A1 EP 3279523A1 EP 17184475 A EP17184475 A EP 17184475A EP 3279523 A1 EP3279523 A1 EP 3279523A1
Authority
EP
European Patent Office
Prior art keywords
transmission
actuation unit
coupling member
transmission member
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17184475.6A
Other languages
German (de)
French (fr)
Other versions
EP3279523B1 (en
Inventor
Giorgio Scalici
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dana Graziano SRL
Original Assignee
Oerlikon Graziano SpA
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Filing date
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Application filed by Oerlikon Graziano SpA filed Critical Oerlikon Graziano SpA
Publication of EP3279523A1 publication Critical patent/EP3279523A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H63/00Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30Constructional features of the final output mechanisms
    • F16H63/34Locking or disabling mechanisms
    • F16H63/3416Parking lock mechanisms or brakes in the transmission
    • F16H63/3458Parking lock mechanisms or brakes in the transmission with electric actuating means, e.g. shift by wire
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H63/00Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30Constructional features of the final output mechanisms
    • F16H63/34Locking or disabling mechanisms
    • F16H63/3416Parking lock mechanisms or brakes in the transmission
    • F16H63/3458Parking lock mechanisms or brakes in the transmission with electric actuating means, e.g. shift by wire
    • F16H63/3466Parking lock mechanisms or brakes in the transmission with electric actuating means, e.g. shift by wire using electric motors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H63/00Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30Constructional features of the final output mechanisms
    • F16H63/304Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H63/00Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30Constructional features of the final output mechanisms
    • F16H63/34Locking or disabling mechanisms
    • F16H63/3416Parking lock mechanisms or brakes in the transmission
    • F16H63/3491Emergency release or engagement of parking locks or brakes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1288Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is an actuator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1292Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the power supply, e.g. the electric power supply
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H63/00Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30Constructional features of the final output mechanisms
    • F16H63/304Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force
    • F16H2063/3066Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force using worm gears

Definitions

  • the present invention relates in general to an actuation unit for controlling the angular position of a control member, in particular a control member used in a vehicle transmission, for example for controlling a locking device for locking the vehicle transmission when the vehicle is parked (the so called park-lock device).
  • An actuation unit according to the preamble of independent claim 1 is known, for example, from document WO 02/21022 A1 .
  • This document discloses an actuation unit for a vehicle transmission comprising a control member, in particular a driving shaft, a primary motor, in particular an electric motor, a transmission mechanism which is interposed between the primary motor and the control member to transmit to the control member the motion generated by the primary motor and comprises two transmission members arranged to engage with each other, a spring for normally keeping the two transmission members disengaged from each other, and an electromagnet for moving one of the transmission members towards the other one to engage it.
  • the invention is based on the idea of providing an actuation unit wherein the transmission mechanism comprises:
  • the auxiliary actuation device is controlled to shift the coupling member into the disengagement position to disengage the first and the second transmission members from each other.
  • the second transmission member which is drivingly connected for rotation with the control member, rotates with respect to the first transmission member as a result of the elastic action of the first elastic means until it reaches a predefined angular position.
  • said predefined angular position of the control member may correspond to a certain mode of operation of the transmission, for example the neutral mode or the parking mode.
  • the actuation unit may advantageously be associated to a locking device for locking the transmission when the vehicle is parked (hereinafter simply referred to as "park-lock device") in order to automatically activate the park-lock device in case of emergency, for example in case of failure or non-operation (due for example to a too low battery charge level or to a failure of the electrical system of the vehicle) of the primary motor.
  • park-lock device a locking device for locking the transmission when the vehicle is parked
  • the coupling member is normally kept by second elastic means in the engagement position (so that the first and second transmission members are normally connected for rotation with each other) and shifting of the coupling member from the engagement position to the disengagement position must be controlled by the auxiliary actuation device, movement of the control member into the predefined angular position does not occur automatically in case of emergency, but is to be authorized by an electronic control unit managing the operation of the actuation unit, in case the auxiliary actuation device is a motor, for example an electric motor, or by the user, in case the auxiliary actuation device is a manual device.
  • the activation of the safe mode of the actuation unit can thus be subject to a series of preliminary checks (including, for example, checking the driving speed of the vehicle), so that movement of the control member into the predefined angular position (in this case, the angular position corresponding to the parking mode) occurs if and only if all the preliminary checks have been successfully completed.
  • an actuation unit according to an embodiment of the present invention is generally indicated 10.
  • the actuation unit 10 is arranged to control the angular position of a control member 12 (in particular, but not necessarily, a control member of a vehicle transmission) about an axis of rotation x.
  • the control member 12 is a shaft which is rotatable about the axis of rotation x and carries a gearwheel 14.
  • the invention is not however limited to the case of a control member made as a shaft, but the control member may be any other type of rotating member.
  • the control member 12 is intended to control a park-lock device, generally indicated 16, but of course it could be used to control any other device, not necessarily a device mounted on a vehicle transmission.
  • the device 16 will not be described in detail here, both because it is of a per-se-known type and because it does not form part of the present invention.
  • the actuator unit 10 comprises first of all a primary motor 18, preferably made as an electric motor, having a drive shaft 20 on which a pinion 22 is mounted.
  • the actuator unit 10 further comprises a transmission mechanism interposed between the primary motor 18 and the control member 12 to transmit the rotary motion generated by the primary motor 18 to the control member 12.
  • the transmission mechanism comprises a first rotary transmission member 24 arranged to be driven into rotation by the drive shaft 20 of the primary motor 18 and a second rotary transmission member 26 drivingly connected for rotation with the control member 12.
  • the first rotary transmission member 24 is permanently connected for rotation with the drive shaft 20 of the primary motor 18.
  • the first transmission member 24 is a gearwheel (and for this reason the first transmission member 24 will be hereinafter referred to as gearwheel 24) meshing with the pinion 22.
  • the gearwheel 24 may directly mesh with the pinion 22, as in the proposed embodiment, or, alternatively, there may be provided one or more intermediate gearwheels between the pinion 22 and the gearwheel 24, which are suitably sized depending on the desired transmission ratio between the pinion 22 and the gearwheel 24.
  • the second transmission member 26 is a shaft (and for this reason the second transmission member 26 will be hereinafter referred to as shaft 26), preferably arranged coaxially with the control member 12.
  • the gearwheel 24 is idly mounted on the shaft 26.
  • the actuation unit 10 further comprises an engagement sleeve 28 that is mounted on the shaft 26 so as to be drivingly connected for rotation with said shaft, but axially slidable relative to said shaft.
  • the engagement sleeve 28 comprises a flange 30 having a hole 32 arranged to be engaged by a pin 34 axially protruding from the face of the gearwheel 24 facing towards the engagement sleeve 28.
  • the engagement sleeve 28 is elastically urged by a spring 36 towards the gearwheel 24, so that the hole 32 of the engagement sleeve 28 is normally engaged by the pin 34 of the gearwheel 24 and thus the engagement sleeve 28 is coupled for rotation with the gearwheel 24.
  • the engagement sleeve 28 is drivingly connected for rotation with the shaft 26, as explained above, in this condition the gearwheel 24 and the shaft 26 are drivingly connected for rotation with each other through the engagement sleeve 28.
  • the actuation unit 10 further comprises an auxiliary actuation device 38 arranged to control the axial displacement of the engagement sleeve 28 from the engagement position to the disengagement position, in which disengagement position the pin 34 of the gearwheel 24 is disengaged from the hole 32 of the engagement sleeve 28, and thus the gearwheel 24 and the shaft 26 are free to rotate with respect to each other.
  • the auxiliary actuation device 38 may be a motor (for example an electric motor) or a manual actuation device to be controlled directly or indirectly by the user (for example, through a cable).
  • the auxiliary actuation device 38 acts on the engagement sleeve 28 through, for example, a fork 40, as shown in particular in Figure 4 .
  • auxiliary actuation device 38 may indifferently be a linear motor, such as for example a linear solenoid (as in the embodiment shown in the drawings), or a rotary motor, preferably an electric motor, and in this second case it may be provided with a motion conversion mechanism (for example a nut-and-screw mechanism) for converting the rotary motion generated by the motor into a translation motion of the fork 40, or of at least a portion of the fork 40.
  • the auxiliary actuation device 38 may also be configured to control the engagement sleeve directly, thus without the need for a fork or any other actuation member interposed between the auxiliary actuation device 38 and the engagement sleeve 28.
  • auxiliary actuation device 38 is made as a motor
  • the auxiliary actuation device 38, as well as the primary motor 18, is controlled by an electronic control unit (not shown) that manages oversees the operation of the actuation unit 10.
  • the actuation unit 10 further comprises elastic means, separate from the spring 36, interposed between the gearwheel 24 and the shaft 26 to cause a relative rotation of the shaft 26 with respect to the gearwheel 24 when the engagement sleeve 28 is in the disengagement position.
  • Said elastic means are formed, for example, by a preloaded spring 42, having an end connected to the gearwheel 24 and the opposed end connected to the shaft 26.
  • the spring 42 is a flat spiral spring with a rectangular cross-section and is preferably accommodated within the gearwheel 24.
  • the engagement sleeve 28 is kept by the spring 36 in the engagement position, in which it is drivingly connected for rotation with the gearwheel 24 thanks to the engagement of the pin 34 of the gearwheel 24 in the hole 32 of the engagement sleeve 28.
  • the rotary motion in either direction generated by the primary motor is transmitted to the shaft 26, and thus to the control member 12, through the pinion 22, the gearwheel 24 and the engagement sleeve 28.
  • the auxiliary actuation device 38 When, in case of emergency, the auxiliary actuation device 38 is activated by the electronic control unit, for example - in case the actuation unit 10 is used on a vehicle transmission - because of a failure in the electrical system or because of a too low battery charge level, the auxiliary actuation device 38 causes the engagement sleeve 28 to shift from the engagement position to the disengagement position. Accordingly, the shaft 26, and thus the control member 12, is free to rotate with respect to the gearwheel 24, as it is no more coupled to said wheel through the engagement sleeve 28. Therefore, as a result of the preload of the spring 42 interposed between the gearwheel 24 and the shaft 26, the gearwheel 24 and the shaft 26 rotate with respect to each other.
  • end stop means are associated with the gearwheel 24 to prevent rotation of the gearwheel 24 beyond a certain limit, so that the elastic energy stored in the spring 42 ensures that the shaft 26, and thus the control member 12, is able to rotate up to a certain end position corresponding with said predefined angular position.
  • the actuation unit 10 can then easily be brought back to the normal operating position by loading the spring 42 and bringing the engagement sleeve 28 back to the engagement position in which it is coupled with the gearwheel 24 by engagement of the pin 34 in the hole 32. Such an operation may be carried out by properly controlling the primary motor 18.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Gear Transmission (AREA)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
  • Arrangement Of Transmissions (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The actuation unit (10) comprises a primary motor (18) and a transmission mechanism (22, 24, 26, 28, 36, 38) for transmitting to a control member (12) the motion generated by the primary motor (18). The transmission mechanism (22, 24, 26, 28, 36, 38) comprises: a first rotary transmission member (24) connected to a drive shaft (20) of the primary motor (18); a second rotary transmission member (26) arranged to be drivingly connected for rotation with the control member (12); a coupling member (28) selectively shiftable between an engagement position, in which it connects the first and second transmission members (24, 26) for rotation with each other, and a disengagement position, in which it disconnects the first and second transmission members (24, 26) from each other; first elastic means (42) interposed between the first and second transmission members (24, 26) to cause rotation of the second transmission member (26) relative to the first transmission member (24) when the coupling member (28) is in the disengagement position; second elastic means (36) tending to elastically urge the coupling member (28) towards the engagement position, so that the coupling member (28) is normally kept in the engagement position; and an auxiliary actuation device (38) arranged to control shifting of the coupling member (28) from the engagement position and the disengagement position, acting against the second elastic means (36).

Description

  • The present invention relates in general to an actuation unit for controlling the angular position of a control member, in particular a control member used in a vehicle transmission, for example for controlling a locking device for locking the vehicle transmission when the vehicle is parked (the so called park-lock device).
  • An actuation unit according to the preamble of independent claim 1 is known, for example, from document WO 02/21022 A1 . This document discloses an actuation unit for a vehicle transmission comprising a control member, in particular a driving shaft, a primary motor, in particular an electric motor, a transmission mechanism which is interposed between the primary motor and the control member to transmit to the control member the motion generated by the primary motor and comprises two transmission members arranged to engage with each other, a spring for normally keeping the two transmission members disengaged from each other, and an electromagnet for moving one of the transmission members towards the other one to engage it. Such a known solution is affected by the problem that in case of interruption in the electric power supply the two transmission members are automatically disengaged from each other by virtue of the elastic force generated by the spring. In case of application of the actuation unit for controlling the park lock device of a vehicle, this means that in case of interruption in the electric power supply the vehicle is automatically locked in the parked condition, even though this is unnecessary and/or undesired.
  • It is an object of the present invention to provide an actuation unit of the above-identified type which is provided with a safety function such that in case of emergency, for example in case of failure or non-operation of the primary motor, the control member is moved to a predefined angular position, and which is not affected by the shortcoming of the prior art discussed above.
  • This and other objects are fully achieved according to the present invention by virtue of an actuation unit having the features defined in independent claim 1.
  • Advantageous embodiments of the invention form the subject-matter of the dependent claims, the content of which is to be intended as forming an integral and integrating part of the following description.
  • In short, the invention is based on the idea of providing an actuation unit wherein the transmission mechanism comprises:
    • a first rotary transmission member arranged to be driven into rotation by the primary motor,
    • a second rotary transmission member drivingly connected for rotation with the control member,
    • a coupling member selectively shiftable between an engagement position, in which it connects the first and second transmission members for rotation with each other, and a disengagement position, in which it disconnects the first and second transmission members from each other,
    • first elastic means interposed between the first and the second transmission members to cause relative rotation of the second transmission member with respect to the first transmission member when the coupling member is in the disengagement position,
    • second elastic means tending to elastically urge the coupling member towards the engagement position, so that the coupling member is normally kept in the engagement position, and
    • an auxiliary actuation device arranged to control shifting of the coupling member from the engagement position, in which it is normally kept by the second elastic means, to the disengagement position.
  • In case of emergency, for example in case of failure or non-operation of the primary motor, the auxiliary actuation device is controlled to shift the coupling member into the disengagement position to disengage the first and the second transmission members from each other. With the coupling member in the disengagement position, the second transmission member, which is drivingly connected for rotation with the control member, rotates with respect to the first transmission member as a result of the elastic action of the first elastic means until it reaches a predefined angular position. In case the actuation unit is used in a vehicle transmission, said predefined angular position of the control member may correspond to a certain mode of operation of the transmission, for example the neutral mode or the parking mode. In this respect, the actuation unit may advantageously be associated to a locking device for locking the transmission when the vehicle is parked (hereinafter simply referred to as "park-lock device") in order to automatically activate the park-lock device in case of emergency, for example in case of failure or non-operation (due for example to a too low battery charge level or to a failure of the electrical system of the vehicle) of the primary motor.
  • Since the coupling member is normally kept by second elastic means in the engagement position (so that the first and second transmission members are normally connected for rotation with each other) and shifting of the coupling member from the engagement position to the disengagement position must be controlled by the auxiliary actuation device, movement of the control member into the predefined angular position does not occur automatically in case of emergency, but is to be authorized by an electronic control unit managing the operation of the actuation unit, in case the auxiliary actuation device is a motor, for example an electric motor, or by the user, in case the auxiliary actuation device is a manual device. It is thus possible to avoid that an event that is not to be regarded as an "emergency" (for example a very short interruption in the electric power supply) might lead to the activation of the safe mode of the actuation unit, that is to the movement of the control member into the predefined angular position, contrary to the prior art. In case, for example, the actuation unit is intended to control a park-lock device of the vehicle, the activation of the safe mode of the actuation unit can thus be subject to a series of preliminary checks (including, for example, checking the driving speed of the vehicle), so that movement of the control member into the predefined angular position (in this case, the angular position corresponding to the parking mode) occurs if and only if all the preliminary checks have been successfully completed.
  • Further features and advantages of the present invention will become apparent from the following detailed description, given purely by way of non-limiting example with reference to the appended drawings, where:
    • Figure 1 is a perspective view of an actuation unit according to an embodiment of the present invention, associated to a park-lock device of a motor vehicle;
    • Figures 2 and 3 are exploded views, from different point of views, of the actuation unit of Figure 1; and
    • Figure 4 is a side elevation view of the actuation unit of Figure 1.
  • With reference to the drawings, an actuation unit according to an embodiment of the present invention is generally indicated 10.
  • The actuation unit 10 is arranged to control the angular position of a control member 12 (in particular, but not necessarily, a control member of a vehicle transmission) about an axis of rotation x. In the exemplary embodiment shown in the drawings, the control member 12 is a shaft which is rotatable about the axis of rotation x and carries a gearwheel 14. The invention is not however limited to the case of a control member made as a shaft, but the control member may be any other type of rotating member. Furthermore, in the proposed exemplary embodiment the control member 12 is intended to control a park-lock device, generally indicated 16, but of course it could be used to control any other device, not necessarily a device mounted on a vehicle transmission. The device 16 will not be described in detail here, both because it is of a per-se-known type and because it does not form part of the present invention.
  • The actuator unit 10 comprises first of all a primary motor 18, preferably made as an electric motor, having a drive shaft 20 on which a pinion 22 is mounted. The actuator unit 10 further comprises a transmission mechanism interposed between the primary motor 18 and the control member 12 to transmit the rotary motion generated by the primary motor 18 to the control member 12.
  • The transmission mechanism comprises a first rotary transmission member 24 arranged to be driven into rotation by the drive shaft 20 of the primary motor 18 and a second rotary transmission member 26 drivingly connected for rotation with the control member 12.
  • Preferably, the first rotary transmission member 24is permanently connected for rotation with the drive shaft 20 of the primary motor 18. According to the embodiment shown in the drawings, the first transmission member 24 is a gearwheel (and for this reason the first transmission member 24 will be hereinafter referred to as gearwheel 24) meshing with the pinion 22. The gearwheel 24 may directly mesh with the pinion 22, as in the proposed embodiment, or, alternatively, there may be provided one or more intermediate gearwheels between the pinion 22 and the gearwheel 24, which are suitably sized depending on the desired transmission ratio between the pinion 22 and the gearwheel 24.
  • According to the embodiment shown in the drawings, the second transmission member 26 is a shaft (and for this reason the second transmission member 26 will be hereinafter referred to as shaft 26), preferably arranged coaxially with the control member 12. The gearwheel 24 is idly mounted on the shaft 26.
  • The actuation unit 10 further comprises an engagement sleeve 28 that is mounted on the shaft 26 so as to be drivingly connected for rotation with said shaft, but axially slidable relative to said shaft. The engagement sleeve 28 comprises a flange 30 having a hole 32 arranged to be engaged by a pin 34 axially protruding from the face of the gearwheel 24 facing towards the engagement sleeve 28. The engagement sleeve 28 is elastically urged by a spring 36 towards the gearwheel 24, so that the hole 32 of the engagement sleeve 28 is normally engaged by the pin 34 of the gearwheel 24 and thus the engagement sleeve 28 is coupled for rotation with the gearwheel 24. As the engagement sleeve 28 is drivingly connected for rotation with the shaft 26, as explained above, in this condition the gearwheel 24 and the shaft 26 are drivingly connected for rotation with each other through the engagement sleeve 28.
  • The actuation unit 10 further comprises an auxiliary actuation device 38 arranged to control the axial displacement of the engagement sleeve 28 from the engagement position to the disengagement position, in which disengagement position the pin 34 of the gearwheel 24 is disengaged from the hole 32 of the engagement sleeve 28, and thus the gearwheel 24 and the shaft 26 are free to rotate with respect to each other.
  • The auxiliary actuation device 38 may be a motor (for example an electric motor) or a manual actuation device to be controlled directly or indirectly by the user (for example, through a cable). The auxiliary actuation device 38 acts on the engagement sleeve 28 through, for example, a fork 40, as shown in particular in Figure 4.
  • In case the auxiliary actuation device 38 is made as a motor, it may indifferently be a linear motor, such as for example a linear solenoid (as in the embodiment shown in the drawings), or a rotary motor, preferably an electric motor, and in this second case it may be provided with a motion conversion mechanism (for example a nut-and-screw mechanism) for converting the rotary motion generated by the motor into a translation motion of the fork 40, or of at least a portion of the fork 40. Alternatively, the auxiliary actuation device 38 may also be configured to control the engagement sleeve directly, thus without the need for a fork or any other actuation member interposed between the auxiliary actuation device 38 and the engagement sleeve 28.
  • In case the auxiliary actuation device 38 is made as a motor, the auxiliary actuation device 38, as well as the primary motor 18, is controlled by an electronic control unit (not shown) that manages oversees the operation of the actuation unit 10.
  • The actuation unit 10 further comprises elastic means, separate from the spring 36, interposed between the gearwheel 24 and the shaft 26 to cause a relative rotation of the shaft 26 with respect to the gearwheel 24 when the engagement sleeve 28 is in the disengagement position. Said elastic means are formed, for example, by a preloaded spring 42, having an end connected to the gearwheel 24 and the opposed end connected to the shaft 26. According to the embodiment shown in the drawings, the spring 42 is a flat spiral spring with a rectangular cross-section and is preferably accommodated within the gearwheel 24.
  • The operation of the above-described actuation unit 10 will be now briefly described, with particular reference to the case of an auxiliary actuation device made as a motor.
  • In normal operating conditions, the engagement sleeve 28 is kept by the spring 36 in the engagement position, in which it is drivingly connected for rotation with the gearwheel 24 thanks to the engagement of the pin 34 of the gearwheel 24 in the hole 32 of the engagement sleeve 28. In such a condition, therefore, the rotary motion in either direction generated by the primary motor is transmitted to the shaft 26, and thus to the control member 12, through the pinion 22, the gearwheel 24 and the engagement sleeve 28. When, in case of emergency, the auxiliary actuation device 38 is activated by the electronic control unit, for example - in case the actuation unit 10 is used on a vehicle transmission - because of a failure in the electrical system or because of a too low battery charge level, the auxiliary actuation device 38 causes the engagement sleeve 28 to shift from the engagement position to the disengagement position. Accordingly, the shaft 26, and thus the control member 12, is free to rotate with respect to the gearwheel 24, as it is no more coupled to said wheel through the engagement sleeve 28. Therefore, as a result of the preload of the spring 42 interposed between the gearwheel 24 and the shaft 26, the gearwheel 24 and the shaft 26 rotate with respect to each other.
  • Preferably, end stop means are associated with the gearwheel 24 to prevent rotation of the gearwheel 24 beyond a certain limit, so that the elastic energy stored in the spring 42 ensures that the shaft 26, and thus the control member 12, is able to rotate up to a certain end position corresponding with said predefined angular position.
  • The actuation unit 10 can then easily be brought back to the normal operating position by loading the spring 42 and bringing the engagement sleeve 28 back to the engagement position in which it is coupled with the gearwheel 24 by engagement of the pin 34 in the hole 32. Such an operation may be carried out by properly controlling the primary motor 18.
  • Naturally, the principle of the invention remaining unchanged, the embodiments and constructional details may vary widely with respect to those described and illustrated here purely by way of a non-limiting example, without thereby departing from the scope of the invention as defined in the accompanying claims.

Claims (9)

  1. Actuation unit (10) for controlling the angular position of a control member (12), comprising a primary motor (18) and a transmission mechanism (22, 24, 26, 28, 36, 38) for transmitting to the control member (12) the motion generated by the primary motor (18), wherein the transmission mechanism (22, 24, 26, 28, 36, 38) comprises
    a first rotary transmission member (24) arranged to be driven into rotation by the primary motor (18),
    a second rotary transmission member (26) arranged to be drivingly connected for rotation with the control member (12),
    a coupling member (28) selectively shiftable between an engagement position, in which it connects the first and second transmission members (24, 26) for rotation with each other, and a disengagement position, in which it disconnects the first and second transmission members (24, 26) from each other,
    an auxiliary actuation device (38) arranged to control shifting of the coupling member (28) between the engagement position and the disengagement position, and
    first elastic means (42) interposed between the first and second transmission members (24, 26) to cause rotation of the second transmission member (26) relative to the first transmission member (24) when the coupling member (28) is in the disengagement position,
    characterized in that the transmission mechanism (22, 24, 26, 28, 36, 38) further comprises second elastic means (36) tending to elastically urge the coupling member (28) towards the engagement position, so that the coupling member (28) is normally kept in the engagement position and the auxiliary actuation device (38), when activated, controls shifting of the coupling member (28) from the engagement position to the disengagement position, acting against said second elastic means (36) .
  2. Actuation unit according to claim 1, wherein the first transmission member (24) is a gearwheel and the second transmission member (26) is a shaft on which the first transmission member (24) is idly mounted.
  3. Actuation unit according to claim 2, wherein the coupling member (28) is a sleeve mounted on the second transmission member (26) so as to be drivingly connected for rotation with the second transmission member (26), but axially slidable relative to the second transmission member (26) between the engagement position and the disengagement position, and wherein the coupling member (28) and the first transmission member (24) are provided with respective engagement means (32, 34) arranged to engage with each other when the coupling member (28) is in the engagement position.
  4. Actuation unit according to claim 3, wherein said second elastic means (36) comprise a spring tending to urge the coupling member (28) towards the first transmission member (24) to couple the coupling member (28) for rotation with the first transmission member (24).
  5. Actuation unit according to any of the preceding claims, wherein the first transmission member (24) is permanently connected to a drive shaft (20) of the primary motor (18).
  6. Actuation unit according to any of the preceding claims, wherein said first elastic means (42) comprise a preloaded spring, which is connected at a first end thereof to the first transmission member (24) and at the other end thereof to the second transmission member (26).
  7. Actuation unit according to any of the preceding claims, wherein the auxiliary actuation device (38) is a motor, preferably an electric motor.
  8. Actuation unit according to any of claims 1 to 6, wherein the auxiliary actuation device (38) is a manually-operable actuation device, arranged to be directly or indirectly operated by a user.
  9. Vehicle transmission comprising a park-lock device (16) for locking the transmission when the vehicle is parked, a rotary control member (12) for controlling the park-lock device (16) and an actuation unit (10) according to any of the preceding claims, wherein said actuation unit (10) is arranged to control the angular position of said control member (12).
EP17184475.6A 2016-08-04 2017-08-02 Actuation unit for controlling the angular position of a control member, particularly for a vehicle transmission Active EP3279523B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000082166A IT201600082166A1 (en) 2016-08-04 2016-08-04 Actuator assembly for controlling the angular position of a control member, particularly for vehicle transmission.

Publications (2)

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EP3279523A1 true EP3279523A1 (en) 2018-02-07
EP3279523B1 EP3279523B1 (en) 2020-09-30

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EP17184475.6A Active EP3279523B1 (en) 2016-08-04 2017-08-02 Actuation unit for controlling the angular position of a control member, particularly for a vehicle transmission

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US (1) US10598280B2 (en)
EP (1) EP3279523B1 (en)
JP (1) JP2018066470A (en)
CN (1) CN107687515B (en)
BR (1) BR102017016699A2 (en)
IT (1) IT201600082166A1 (en)
RU (1) RU2017127785A (en)

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EP3670974A1 (en) * 2018-12-20 2020-06-24 FTE automotive GmbH Electromechanical parking-lock actuator

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
KR20200060910A (en) * 2018-11-23 2020-06-02 현대자동차주식회사 Gear shifting device for multi-speed transmission of electric vehicles
KR20200062505A (en) * 2018-11-27 2020-06-04 현대자동차주식회사 Gear shifting device for multi-speed transmission of electric vehicles
CN111677858B (en) * 2019-03-11 2023-01-31 舍弗勒技术股份两合公司 Power coupling control device
DE102019130396A1 (en) * 2019-11-11 2021-05-12 Küster Holding GmbH Device for actuating a parking lock in an automatic transmission of a motor vehicle
CN111609128B (en) * 2020-05-19 2021-09-21 蜂巢传动系统(江苏)有限公司 Emergency parking device for vehicle and vehicle
CN111609129B (en) * 2020-05-20 2021-07-20 蜂巢传动系统(江苏)有限公司 Emergency parking device for vehicle and vehicle with same
CN111609130B (en) * 2020-05-20 2021-08-20 蜂巢传动系统(江苏)有限公司 Emergency parking device for vehicle and vehicle with same

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US5620077A (en) * 1994-06-01 1997-04-15 Electric Vehicle Controllers Ltd. Fail-safe brake actuation system
WO2002021022A1 (en) 2000-09-06 2002-03-14 ZF Lemförder Metallwaren AG Device for shifting a mechanical shifting element between a first shifting state and at least a second shifting state
DE10105637A1 (en) * 2001-02-08 2002-08-29 Volkswagen Ag Parking lock has main actuation lever via which spring storage device, actuating drive and locking device are connected to or can be brought into interaction with actuating element
DE10157460A1 (en) * 2001-11-23 2003-06-05 Daimler Chrysler Ag Arrangement for applying vehicle parking lock with electric motor, has emergency actuating element for engaging parking lock element and parking lock wheel irrespective of motor position

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EP3670974A1 (en) * 2018-12-20 2020-06-24 FTE automotive GmbH Electromechanical parking-lock actuator

Also Published As

Publication number Publication date
BR102017016699A2 (en) 2018-02-27
RU2017127785A (en) 2019-02-05
JP2018066470A (en) 2018-04-26
US20180038480A1 (en) 2018-02-08
US10598280B2 (en) 2020-03-24
CN107687515B (en) 2020-12-08
CN107687515A (en) 2018-02-13
IT201600082166A1 (en) 2018-02-04
EP3279523B1 (en) 2020-09-30

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